Polarization modulator



FIG. 1 is a perspective view of a polarization modulator, in accordance with the present design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top elevational view thereof; and,

FIG. 7 is a bottom elevational view thereof. 

CLAIM The ornamental design for a polarization modulator, as shown and described. 